Why don’t we relate triangles to an array model? 2nd grade mcps homework
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Anonymous
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Can anyone tell me the answer and explain it to me?
This is for the 2nd grade distance learning, and my kid and I are both stumped. Thanks! |
Anonymous
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That is a terribly worded question for a 2nd grader, but the answer is because you need the same number of items in each row.
So the "array model" looks like this 2 x 3 xx xx xx or xxx xxx But you can't use a triangle because it wouldn't work. |
Anonymous
| Triangles have 3 sides and arrays have rows and columns with the same number in each row and column, so we can’t relate triangles (3 sides) to an array (4 “sides” needed). It is not worded very well but it’s taken straight from a Eureka discussion question. |
Anonymous
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X
XX XXX XXXX You don't have equal groups in a triangle. |
Anonymous
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Need equal number in each row and equal number in each column, so it has to be a rectangle/square.
The question was awfully written though. |
Anonymous
| My second grader very confidently demonstrated how you could split squares and rectangles into triangles and therefore combine two arrays... Not correct, but very confident. |
Anonymous
That's great, PP! I love the thinking about math. |
Anonymous
Often called upper triangle or lower triangle in linear algebra. The question is poorly considered. |
Anonymous
| LOL! I just did he problem with my DS and thought WTF?? |
Anonymous
Because it’s probably written by someone who doesn’t have a degree in Math. That would be my guess. |
Anonymous
Op here. My initial response was wtf?!?! Then I texted my sister who teaches for mcps, and she kindly sent me a link to a 200+ page doc and said, “I’m on a zoom meeting, but you can find the answer somewhere in here ;0)” So I crowd sourced here. Thanks! Candidly, I’m so tempted to just have my 2nd grader continue to focus on multiplication facts and division exercises I’ve been providing rather than this nonsense. |
Anonymous
Well, if her school is not already doing Eureka math this year then they will be doing it next year so it’s not a terrible thing to expose her to the vocabulary and strategies used in Eureka. Otherwise she’s going to have to get used to all of it in 3rd grade. Think of it as a preview for next year. |
Anonymous
PP, I love linear algebra, but we're talking about math for second-graders here. |
Anonymous
We’re doing that also. Our school was not using Eureka Math before this. I do agree with the PP though. At least it’ll help your kid get used to the terms, like ‘array’? |
Anonymous
The other confusing thing (to me!) is that for all the prior exercises, they have had the kids using different objects!! Like chairs and faces, etc. And today, our of nowhere, they have made the jump to say that you CAN’T actually use those shapes, and a ‘true’ array has to be made from squares. Which is fine, but maybe they could have used squares all along? |